Abstract
SUMMARYSoils from grass-arable cropping sequences and from an experiment where grassland had been treated with slurry were dispersed by shaking as a soil-water mixture, followed by ultrasonic treatment. Organo-mineral particle size fractions were separated by sieving and by sedimentation.Generally, concentration of C and N in the fractions decreased with increasing particle size. However, when expressed as weight of C per fraction maximum contents were in the 2–10 μm range. With N, maximum contents occurred about 2 μm. Largest differences in C and N contents between soils were found in the 0·2–20 μm size range.Identification of the source of the materials in the various fractions was attempted by interpretation of the C/N ratios, but was generally inconclusive.
Publisher
Cambridge University Press (CUP)
Subject
Genetics,Agronomy and Crop Science,Animal Science and Zoology
Reference10 articles.
1. Soils of Northern Ireland and their influence upon agriculture;McAllister;Record of Agricultural Research,1968
2. Water-Dispersible Soil Organic-Mineral Particles: I. Carbon and Nitrogen Distribution
3. Macro organic matter content of some Northern Ireland soils;Adams;Record of Agricultural Research,1980
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